body {
    width: 100%;
    margin: 0 auto;
    min-width: 320px;
    max-width: 750px;

    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 14px;
    line-height: 1.5;

    background-color: #fff;
    color: #666;
}